Things your smart phone can replace-4

4. MEASURING TAPES
You don't have to carry a tape to get near-accurate measurements anymore. Just download an app. These commonly use trigonometry to calculate distances while some use GPS, better for irregular surfaces or areas.While hunting for a house, you can measure how high the ceiling is or calculate the floor area. You should be able to spot inconsistencies pretty fast. But keep in mind that these apps, which use augmented reality, are not accurate to the dot. You will need to double check. Some even come with a unit convertor.